Single Track

Balanced/ Modified:

• Balanced calendars are usually 45/10, 45/15, 60/20/or 90/30
  calendars which can provide any number of instructional days.
• Summer vacation is divided throughout a school year with
  staff and students at school at the same time. Intersessions
  are usually offered during the break times.

Extended School Year:

• Lengthened from the current 170-180 instructional days up to
  240 instructional days.
• Approximately 245 possible days remain after Saturdays,
  Sundays, federal and state holidays are subtracted from
  the 365-day calendar.)

Flexible All-Year Calendar:

• School is open for instruction approximately 240 days per year and
  students are required to attend the minimum number of days
  designated by each state.
• Education is individualized; students and staff vacation throughout
  the year in short breaks.

Multi-track

Three-Track:

• Increases capacity by up to 50%.
• Concept 6 and Modified Concept 6 Calendars are generally
  limited to 163 instructional days that are lengthened in order to
  accommodate state-required cumulative annual instructional minutes.
• Concept 6 offers 2 vacations/intersessions of approximately
  41 school days each.
• Modified Concept 6 offers 4 vacations/intersessions of approximately
  20 school days.

Four-Track:

• Increases capacity up to 33%.
• 45/15, 60/20 and 90/30 calendars provide for the authorized
  number of days of instruction.
• 45/15 offers 4 vacations/intersessions of approximately 15
  school days each.
• 60/20 offers 3 vacations/intersessions of approximately 20
  school days each.
• 90/30 offers 2 vacations/intersessions of approximately 30
  school days each.

Five-Track:

• Increases capacity up to 25%.
• 60/15 calendar can allow up to 197 days of instruction.
  Districts utilizing a multi-track 60-15 calendar generally provide
  a 180-day instructional schedule, with a common three-week
  vacation for all tracks in the summer, in addition to each track's
  vacations/intersessions.
• Orchard Plan Calendar provides the common three-week vacation
  of the 60/15 calendar; students receive 3 additional vacation/intersession
  breaks of 15 school days.

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